<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>


    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>
    <!-- 章节 -->
    <ul class="chanpterList">
        <li v-for="chapter in chapterVideoList" :key="chapter.id">
            <p>
                {{ chapter.title }}

                <span class="acts">
                    <el-button type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                    <el-button style="" type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
                    <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
            </p>

            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>{{ video.title }}
                        <span class="acts">
                            <el-button type="text" @click="updateVideo(video.id)">编辑</el-button>
                            <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                        </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <div>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题">
                <el-input v-model="chapter.title"/>
            </el-form-item>
            <el-form-item label="章节排序">
                <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
            <el-upload
                  :on-success="handleVodUploadSuccess"
                  :on-remove="handleVodRemove"
                  :before-remove="beforeVodRemove"
                  :on-exceed="handleUploadExceed"
                  :file-list="fileList"
                  :action="BASE_API+'/eduvod/video/uploadAlyVideo'"
                  :limit="1"
                  class="upload-demo">
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
                <div slot="content">最大支持1G，<br>
                    支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                    GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                    MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                    SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
            </el-tooltip>
            </el-upload>
        </el-form-item>

      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>


  </div>
</template>

<script>
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'

export default {
  data(){
    return{
      saveBtnDisabled: false,
      courseId: '',
      chapterVideoList: [],
      chapter: {// 章节对象
        title: '',
        sort: 0
      },
      video: {// 课时对象
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: ''
      },
      saveVideoBtnDisabled: false,


      dialogChapterFormVisible: false,
      dialogVideoFormVisible: false,

      fileList: [],//上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    }
  },
  created(){
    // 获取路由值
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
      this.getChapterVideo();
    }
  },
  methods:{

    //删除前触发的操作
    beforeVodRemove(file, fileList) {
      return this.$confirm(`确定移除 ${file.name}？`)
    },
    //删除操作 
    handleVodRemove(){
      video.removeById(this.video.videoSourceId)
        .then(res =>{
          this.$message({
            type: 'success',
            message: '删除视频成功！'
          })

          this.fileList = []
          this.video.videoSourceId = ''
          this.video.videoOriginalName = ''
        })
    },
    //成功回调
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId
      this.video.videoOriginalName = file.name
    },
    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },

// ========================================== 对小节的操作 ==========================================
    openVideo(chapterId){
      this.dialogVideoFormVisible = true

      // 设置章节id
      this.video.chapterId = chapterId

      this.video.title = ''
      this.video.sort = 0
      this.video.free = ''
      
      this.fileList = []
      this.video.videoSourceId = ''
      this.video.videoOriginalName = ''
    },

    updateVideo(id){
      this.dialogVideoFormVisible = true

      video.getVideoInfo(id)
        .then(res =>{
          this.video = res.data.eduVideo
        })
    },

    saveOrUpdateVideo(){
      if (this.video.id) {
        this.editVideo()
      } else {
        this.addVideo()
      }
    },

    addVideo(){
      this.video.courseId = this.courseId

      video.addVideo(this.video)
        .then(res =>{
          this.dialogVideoFormVisible = false

          this.$message({
            type: 'success',
            message: '添加章节成功！'
          })

          this.getChapterVideo()
        })
    },

    editVideo(){
      video.editVideo(this.video)
        .then(res =>{
          this.dialogVideoFormVisible = false

          this.$message({
            type: 'success',
            message: '添加章节成功！'
          })

          this.getChapterVideo()
        })
    },

    removeVideo(id){
      this.$confirm('此操作将永久删除小节, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        video.deleteVideo(id)
          .then(res =>{
            this.$message({
              type: 'success',
              message: '删除小节成功!'
            });

            this.getChapterVideo()
          })
      })
    },
// ========================================== 对章节的操作 ==========================================
    openEditChatper(chapterId){
      console.log("--------------------");
      this.dialogChapterFormVisible = true
      chapter.getChapter(chapterId)
        .then(res =>{
          this.chapter = res.data.chapter
        })
    },
    // 根据课程id 查询章节和小节
    getChapterVideo(){
      chapter.getAllChapterVideo(this.courseId)
        .then(res =>{
          this.chapterVideoList = res.data.allChapterVideo
        })
    },
    previous(){
      this.$router.push({ path:'/edu/course/info/'+ this.courseId})
    },

    next(){
      this.$router.push({ path:'/edu/course/publish/'+ this.courseId})
    },

    saveOrUpdate(){
      if (this.chapter.id) {
        this.updateChapter()
      } else {
        this.addChapter()
      }
    },

    addChapter(){
      this.chapter.courseId = this.courseId
      chapter.addChapter(this.chapter)
        .then(res =>{
          
          this.dialogChapterFormVisible = false

          this.$message({
            type: 'success',
            message: '添加章节成功！'
          })

          this.getChapterVideo()
        })
    },

    updateChapter(){
      chapter.updateChapter(this.chapter)
        .then(res =>{
          
          this.dialogChapterFormVisible = false

          this.$message({
            type: 'success',
            message: '修改章节成功！'
          })

          this.getChapterVideo()
        })
    },

    openChapterDialog(){
      this.dialogChapterFormVisible = true
      this.chapter.title = ''
      this.chapter.sort = 0
    },

    removeChapter(id){
      this.$confirm('此操作将永久删除章节记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        chapter.deleteChapter(id)
          .then(res =>{
            this.$message({
              type: 'success',
              message: '删除成功!'
            });

            this.getChapterVideo()
          })
      })
    }
  }
}
</script>

<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>